CAJ | 학술논문

为了研究配体能级与稀土离子最低激发态能级的匹配程度对所形成的稀土配合物荧光性能的影响，以邻氟苯甲酸（2-FBA）为第一配体，邻菲咯啉（phen）为第二配体分别制备两种稀土铽配合物Tb（2-FBA）3·2H2O和Tb（2-FBA）3phen。元素分析和红外光谱表征了两种配合物的分子组成。相同浓度的紫外吸收光谱表明，Tb（2-FBA）3phen的第二配体phen替代第一配体2-FBA吸收了部分紫外光。相同浓度的液体荧光光谱表明，Tb（2-FBA）3·2H2O的荧光发射强度高于Tb（2-FBA）3phen的荧光发射强度。由于Tb（2-FBA）3·2H2O分子结晶水中的O-H振动会大大消耗配体所吸收的能量而使荧光强度大幅度下降；2-FBA配体在273nm的吸收峰所对应的三重态能级必然与能级5D4的匹配程度会更差。在这种情况下Tb（2-FBA）3·2H2O的发射强度依然高于Tb（2-FBA）3phen的发射强度，充分说明了第一配体2-FBA与Tb3的最低激发态能级5D4的匹配程度要好于phen与Tb3＋的最低激发态能级5D4的匹配程度。通过结合紫外吸收光谱和荧光光谱对稀土配合物的配体能级的定性分析，可以初步了解不同类型配体对荧光性能的贡献程度。
위료연구배체능급여희토리자최저격발태능급적필배정도대소형성적희토배합물형광성능적영향，이린불분갑산（2-FBA）위제일배체，린비각람（phen）위제이배체분별제비량충희토특배합물Tb（2-FBA）3·2H2O화Tb（2-FBA）3phen。원소분석화홍외광보표정료량충배합물적분자조성。상동농도적자외흡수광보표명，Tb（2-FBA）3phen적제이배체phen체대제일배체2-FBA흡수료부분자외광。상동농도적액체형광광보표명，Tb（2-FBA）3·2H2O적형광발사강도고우Tb（2-FBA）3phen적형광발사강도。유우Tb（2-FBA）3·2H2O분자결정수중적O-H진동회대대소모배체소흡수적능량이사형광강도대폭도하강；2-FBA배체재273nm적흡수봉소대응적삼중태능급필연여능급5D4적필배정도회경차。재저충정황하Tb（2-FBA）3·2H2O적발사강도의연고우Tb（2-FBA）3phen적발사강도，충분설명료제일배체2-FBA여Tb3적최저격발태능급5D4적필배정도요호우phen여Tb3＋적최저격발태능급5D4적필배정도。통과결합자외흡수광보화형광광보대희토배합물적배체능급적정성분석，가이초보료해불동류형배체대형광성능적공헌정도。
Tb(2-FBA)3 · 2H2O and Tb(2-FBA)3phen were synthesized using o-fluoro-benzoic acid (2 -FBA) as the first lig-and ,and 1 ,10-phenanthroline (phen) as the second ligand .Elemental analysis and IR spectra were employed to characterize the molecular composition of the two kinds of lanthanide complexes .The UV absorption spectra with same concentration show that the second ligand phen of Tb(2-FBA)3 phen absorbs the portion of the UV light instead of the first ligand 2-FBA. Liquid fluores-cence spectra with same concentration show that the fluorescence intensity of Tb (2-FBA)3 · 2H2 O is higher than that of Tb(2-FBA)3 phen. The analytical results show that the energy level of 2-FBA matches the lowest excited state energy level of Tb3+(5 D4 ) better than that of phen. The O- H oscillation of the crystal water in Tb(2-FBA)3 · 2H2O will greatly consume the ab-sorbed energy by ligands ,and cause the fluorescence intensity of Tb(2-FBA)3 · 2H2O significantly decline. The energy level of triplet state of the first ligand 2-FBA corresponding to the absorption peak 273 nm has poor matching degree with the 5 D4 energy level of Tb3+. In this case ,the emission intensity of Tb(2-FBA)3 · 2H2O is still stronger than that of Tb(2-FBA)3phen. It il-lustrates that the energy level of the triplet state of the first ligand 2-FBA corresponding to 252 nm has much better matching de-gree with the lowest excited state of 5 D4 energy level of Tb3+ than that of phen. It is the only way to compensate for energy loss by thermal vibration of water molecules and low energy transfer efficiency for poor matching degree between the energy level of corresponding to 273 nm of the first ligand 2-FBA and 5 D4 energy level of Tb3+. By combining UV absorption spectra with fluo-rescence spectra of lanthanide complexes to qualitatively analyze energy level of ligands ,the contribution of different types of lig-ands to the fluorescence properties can be preliminarily understood .